[gtk+] wayland: Always request transient commit when mapping subsurface

[Jonas Ådahl <jadahl src gnome org>]

commit 0dab37c78fe261fc914e4a12d48e732726f13d43
Author: Jonas Ådahl <jadahl gmail com>
Date:   Wed Jun 17 17:31:19 2015 +0800

    wayland: Always request transient commit when mapping subsurface
    
    A subsurface positioning operation only takes effect when the parent
    surfaces state is applied. If a subsurface is mapped and positioned, but
    the parent surface state is not immediately committed, the relative
    position of the subsurface is undefined and may be placed incorrectly.
    
    To avoid this undefined state, always request that the parent surface
    should be committed after mapping a subsurface so that the position
    operation will take effect.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=751098

 gdk/wayland/gdkwindow-wayland.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)
---
diff --git a/gdk/wayland/gdkwindow-wayland.c b/gdk/wayland/gdkwindow-wayland.c
index 4c448d7..e97175d 100644
--- a/gdk/wayland/gdkwindow-wayland.c
+++ b/gdk/wayland/gdkwindow-wayland.c
@@ -158,6 +158,8 @@ static void gdk_wayland_window_configure (GdkWindow *window,
 
 static void maybe_set_gtk_surface_dbus_properties (GdkWindow *window);
 
+static void gdk_window_request_transient_parent_commit (GdkWindow *window);
+
 GType _gdk_window_impl_wayland_get_type (void);
 
 G_DEFINE_TYPE (GdkWindowImplWayland, _gdk_window_impl_wayland, GDK_TYPE_WINDOW_IMPL)
@@ -882,6 +884,7 @@ gdk_wayland_window_create_subsurface (GdkWindow *window)
                                          impl->surface, parent_impl->surface);
       wl_subsurface_set_position (impl->subsurface, window->x, window->y);
       wl_subsurface_set_desync (impl->subsurface);
+      gdk_window_request_transient_parent_commit (window);
     }
 }